4 US-Made 7B7 Vacuum Tubes Lot Of Four Steven Curtis 9 milliamps with a transconductance

9 milliamps with a transconductance of 2390 micromhos while Tube Two measured 21

They have tall bases

Sorry about the boxes

Tube One measured 1930 micromhos

4 US-Made 7B7 Vacuum Tubes Lot Of Four Steven Curtis 9 milliamps with a transconductanceThis lot of four US made 7B7 tubes was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 41, 42, 44 and 47, respectively, where (65%) is 43 and 100% is 66. They have mica snubbers for increased vibration resistance and lowered microphonics and great flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER